question on mfxVersion

hello Intel-giant,

   I have a question in mediasdk-tutorials-0.0.3. I found something below in simple_1_session/src/simple_session.cpp

    // If more recent API features are needed, change the version accordingly
    mfxIMPL impl = options.values.impl;
    mfxVersion ver = { {0, 1} };

   Q1. Is there any document or release note to describe the modifications among these mfxVersions ??